Materials Literature
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Abstract Oxidative stability and retained operational utility of polymers used as insulation for electrical cables, such as ethylene propylene diene monomer (EPDM) and crosslinked polyethylene (XLPE), may be assessed by oxidation induction time (OIT) analysis. OIT is measured directly with a differential scanning calo…
Electrical conductivity and dielectric properties of single-crystal TlGaSe 2 have been studied as a function of γ irradiation dose in the 100–280 K range including the existence of an incommensurate phase. Anomalies in the form of maxima have been observed in the σ = f ( T ), tan δ = f ( T ), and ɛ = f ( T ) curves at…
The oxidation of 1,2,5-trimethylpyrrole (TMP) in aqueous and organic solvents is studied by various techniques. Heating oxygenated chlorobenzene solutions of TMP results in autoxidation that is initiated via reaction of TMP with O 2 and partly propagated via oxidation of TMP by a TMP-derived peroxyl radical. In radiol…
The van der Waals epitaxy of InSe films was performed on (111)GaAs surface at the growth temperature of 350°C. A spiral trigonal structure was observed on the surface of the InSe films. To improve crystal quality of the InSe films, their orientation control was investigated. The growth rate decreased rapidly as the gr…
The effect of the pressure-pulsed chemical vapour infiltration on improving the quality of CMC-parts has been investigated. In a fabrication process of three-dimensional C/SiC composites, the PCVI was applied as a final densification step for specimens made by a joint process consisting of slurry infiltration and poly…
Polyester dendrimers bearing carbazole units at their peripheries were synthesized by attaching 3,5-bis[4-(9-carbazolyl)butoxy]benzoic acid to the peripherical phenoxy groups. The phenoxy-terminated polyester dendrimers were synthesized by hydrogenation of the corresponding benzyloxy-terminated polyester dendrimers. T…
TAD1 is a psychrophilic strain isolated from continental frozen water in Antarctica. Study of aspartate transcarbamylase in the bacterium shows an impressive activity of this enzyme at low temperature. At 0 degree C, its activity is up to 26% of its maximal activity observed at 30 degrees C. In comparison with the Esc…
The (1)H NMR spectra of a series of manganese-oxo aggregates have been examined, and a characteristic signature was found for each complex. For the dimanganese(III,III) complexes [Mn(2)O(OAc)(2)(HB(pz)(3))(2)], [Mn(2)O(OAc)(2)(tacn)(2)](2+), [Mn(2)O(OAc)(2)(H(2)O)(2)(bpy)(2)](2+), and [Mn(2)O(OAc)(2)(bpta)(2)](2+) (HB…
Three kinds of water-repellent cotton fabrics, A, B, and C-, are produced by alkylation with only 0.07 alkyl units per glucose unit. Sample A is prepared by alkylation by means of acetylation without mercerization, B is by direct alkylation after merceriza tion, and C is by alkylation by means of allylation and bromin…
A hysteresis model is developed on the basis of a physical description of domain wall motion in magnetic materials. The mean behavior of a domain wall under the action of an external field is described by a simplified Preisach model. The superposition of several domain wall contributions to the average magnetization i…
Pseudomonas sp. 61-3 is able to produce a blend of poly(3-hydroxybutyrate) [P(3HB)] homopolymer and a random copolymer [P(3HB-co-3HA)] consisting of 3-hydroxyalkanoate units of 4–12 carbon atoms. In a cell accumulating polyhydroxyalkanoates upon glucose or alkanoic acids, both needle-type and mushroom-type structures…
Dielectric constant (ε′) and electrical conductivity ([sgrave]) of the binary mixtures of cholesteryl pelargonate (ChP) and nonyloxybenzoic acid (NOBA) of different concentrations have been measured in the frequency range of 100 Hz to 10 MHz from room temperature to 150°C both in planar and homeotropic alignments. The…
Abstract A pH-sensitive MRI contrast agent whose signal intensity is activated only at the lower pH was newly designed to establish a novel imaging concept which depict microenvironment differences in pathophysiological features of damaged tissues.
A composition‐graded solid electrolyte has been used to determine the standard Gibbs free energy of formation of lanthanum zirconate (La 2 Zr 2 O 7 ) from the component oxides lanthana (La 2 O 3 ) (A‐rare earth) and zirconia (ZrO 2 ) (monoclinic) in the temperature range of 870–1240 K. The cell used for measurement ca…
An approximate theoretical analysis of the tension increase for nonflexible fibers and yams passing around a peg is presented, yielding a convenient, improved capstan equation. The formulas include the influence of fiber and yarn bending behavior on the tension increase, and they correct the capstan equation for outgo…
FePd L1/sub 0/ ferromagnets with ultra-fine microstructures (submicron/nanoscale) have been studied. The powders and thin films with nanoscale microstructure were produced using high energy ball milling and vacuum sputtering, respectively. These ultra-fine grained materials were characterized using TEM, SEM, and X-ray…
Crystals of human heparin binding protein (HBP) diffract to 1.1 A when flash-frozen at 120 K. The atomic resolution structure has been refined anisotropically using SHELXL96. The final model of HBP consists of 221 amino-acid residues of 225 possible, three glycosylation units, one chloride ion, 15 precipitant ethanol…
Pyrocarbon/silicon carbide (PyC/SiC){sub n} and boron nitride/silicon carbide (BN/SiC){sub n} nanoscale multilayers have been fabricated by pressure pulsed-CVI (P-CVI), pyrocarbon, boron nitride and silicon carbide were deposited from C{sub 3}H{sub 8}, BCl{sub 3}-NH{sub 3} and MTS-H{sub 2} gas precursors, respectively…
In most glass-forming materials external perturbations are relaxed in a non-exponential fashion. It is shown that the degree of non-exponentiality is phenomenologically correlated with the departure from simple thermally activated behavior as measured by the fragility index m. In model glass formers such as the Ge-As-…
The Commission on Neutron Diffraction has initiated a project for compiling accurate temperature factors [International Union of Crystallography (1985). Acta Cryst. B41, 374]. Recommended values of the temperature factors of 14 hexagonal close packed (h.c.p.) elements are presented in this compilation.